SE458591B - DEVICE FOR THE PREPARATION OF AN EXISTING LONG-EXISTING FIBER MATERIAL - Google Patents

Description

I -458 591 In the said Swedish patent specification it is specifically stated that the matrix must be formed with a number of wall portions and that at least one of these wall portions is assigned a relative movement in relation to the member with the relative movement directed in the longitudinal or production direction of the member.

From U.S. Pat. No. 4,673,345 it is previously known that in the case of a device described in the above-mentioned Swedish patent, a high-frequency drying plant is used as the heating device.

DESCRIPTION OF THE CURRENT INVENTION TECHNICAL PROBLEM Taking into account the prior art described above, it appears as a technical problem, when the heating device consists of a high-frequency drying plant, to be able to create such conditions, especially during the start-up or elimination of drying. in any case substantially prevent condensation from precipitating on cold surfaces, which condensate precipitation has been shown to impair the function of the drying plant and can lead to defects in the parts of the drying plant.

Taking into account the above-mentioned technical problem, it is an additional technical problem to come to the realization that a solution to the above-mentioned technical problem lies in designating a precursor of the electrodes. It must also be a technical problem to be able to come to the realization that a heating device intended for preheating the electrode or electrodes can also be used to assign smoother surfaces to the finished product.

It must also be considered a technical problem to be able to designate an electrode heating electrically driven device in a high-frequency drying plant and also create conditions for reducing the effect of the voltage generation which an operation of the 4b8 591 drying plant can provide due to the electrical conductors of the heating device placed in the electromagnetic field.

It is a further technical problem to be able to provide means for sucking water vapor-laden air out of a space enclosed by the electrodes and enclosing electrodes so that the air vapor-laden air can be removed but which does not give an undesirably high cooling of the electrodes. This means that the proportion of extracted water vapor must be adapted to momentarily generated steam. It is also a technical problem to be able to orient a number of heating devices in the immediate vicinity of the electrodes but still create such conditions that the electrodes can be supported against an insulating glass composite material.

Furthermore, while using a glass composite material which is to support the electrodes and to form two opposing matrix walls, it must be considered a technical problem to be able to designate a suitable displacement of the matrix walls and the electrode within the drying plant adapted to the material produced. this takes place in dependence on the movement of a piston, intended to compress the quantity of fibrous material provided with an adhesive.

It is also a technical problem that in a high-frequency drying plant, working with a device for producing an elongate member, create such conditions that the drying plant can be electromagnetically shielded from the environment. THE SOLUTION The present invention can be considered as starting from an apparatus for producing a, of e.g. an elongate member consisting of a fibrous material, by compressing a number of successive quantities, provided with a moist binder, of fibrous material and allowing said compressed quantities of fibrous material to dry by passing the electrodes of a high-frequency drying plant, 458 591; in accordance with what is shown and described in the above-cited U.S. patent.

According to the present invention, it is now proposed that one electrode, preferably both electrodes, included in the drying plant should cooperate with an electrode heating device, adapted to, before starting the manufacturing process for the elongate member, be able to assign details to the electrode and the electrode. a temperature adapted to prevent water condensation.

In addition, it is instructed that air laden with water vapor must be able to be sucked out of a space, which is partly enclosed by the electrodes and partly enclosing the electrodes.

It is hereby instructed that the extracted air volume per unit of time shall be chosen to connect to or substantially connect to water vapor generated in the drying plant.

In the event that the electrode heating device is supplied via an electrical energy supply, this energy supply takes place via an inductance.

It is further indicated that a number of heating devices are located between electrically insulating glass composite material and in immediate connection with the electrode.

The electrical energy supply to the heating device takes place directly for one electrode, namely the electrode that is connected to system earth.

The design of an electrode heating device normally requires a temperature on the electrode sensing thermostat and its sensing will also take place via an inductance. As an exemplary embodiment of the present invention, an utilization of a glass composite material is indicated, and especially if such a glass composite material is used partly as side walls in the drying plant and partly as support for the electrodes included in the drying plant, it is proposed that the lower electrode follow the movement of a piston, intended to compress compressed fiber quantity of fiber material, while the two adjacent side walls, consisting of electrically insulating material, are arranged to be displaced in such a way that a sufficient friction required for splicing the quantities is formed.

In order to obtain a shielding of the high-frequency drying drying system, it is indicated that the electrodes and the glass composite material are at a distance enclosed by an electrically conductive layer, intended to shield the high-frequency electromagnetic field.

It is hereby proposed that first rods formed of glass composite material should be arranged to abut against the compressed quantities along two opposite sides and a plurality of second rods formed of glass composite material are arranged to abut and support the electrodes along two opposite sides.

ADVANTAGES The advantages that can primarily be considered to be associated with a device in accordance with the present invention are that this has created conditions, by heating at least one electrode before starting the manufacturing process for the elongate member, for the manufacturing process to be initiated without that troublesome water condensation occurs on and near the electrodes included in the high-frequency drying plant. 4513 591 What can primarily be considered as characteristic of a device, in accordance with the present invention, is stated in the characterizing part of the appended claim 1.

BRIEF DESCRIPTION OF THE DRAWINGS A presently proposed embodiment, having the features significant to the present invention, will now be described in more detail with reference to the accompanying drawing therein; Figure 1 shows in side view and in strong simplification the basic structure of a device, according to the present invention, for producing an elongate member, shows a section through a now proposed and on the high frequency operating drying plant, used in the device according to Figure 1 Figure 3 shows in simplified form a technical connection arrangement for the electrodes included in a high-frequency drying plant in order to be able to adapt the power output, and Figure 4 shows a simplified connection diagram for an electrical supply of a device heating an electrode. figure 2 DESCRIPTION OF THE CURRENTLY PURCHASED EMBODIMENT FIGURE 1 thus shows in side view and in very strong simplification an idea 1 for producing an elongated or horizontal invention. The device 4 shown in Figure 1 has a hydraulic cylinder 10 with associated piston and piston rod 9. This piston rod is reciprocable and cooperates with a compression member 8, in the form of a piston and which 458 591 extends a piece into a compression chamber 7 and forms a part, namely a rear wall portion, for this compression chamber 7.

The compression chamber 7 is further delimited by a bottom part and two side portions as well as by the last compressed quantity.

Immediately above the compression chamber 7 there is a device 6. The device 6 can in its upper part be formed with a space for fibrous material and a space for moist binder, and by means of a mixing station not shown in the figure the fibrous material and binder are mixed together. - the agent in predetermined proportions and humidity and fed to a lower space Sa. From the lower space, via portioning devices not shown in the figure, a proportion or a quantity of the total fibrous material for the entire member 4 is fed into the compression chamber 7.

It is particularly suitable, however, to use a finished mixture of fibrous material and moist binder which is fed to the device 6 directly, where a quantity is evaluated via a weighing device and where a compression piston or filling piston presses a weighted quantity into the compression chamber 7 and thus forms the upper part of the compression chamber 7. .

In addition to the method of using a fiber suspension, mixed with binder, the elongate member can of course be formed by spraying or wetting a fibrous material with binder and especially in the latter case the material must be fed directly to the compression chamber 7 and subjected to a pressure there.

The material can be cutter chips, paper waste, plastic, sawdust and the like.

The compression member 8, in the form of a piston, is actuated by a hydraulic cylinder 10 with associated piston and piston rod 9 to a reciprocating movement. The compression member 8 is shown in Figure 1 in side view and in a non-458 593 in 8 compressing and thus the compression chamber exposing position. When the compression means is in this position, the space in front of the compression means is filled with fibrous material from the device 6. This can be done by the compression means 8, at said displacement to the position shown in figure 1, exposing an opening and thereby ensuring that the the space or the compression scanner can be filled via a piston not shown in the figure. When the compression member 8 is displaced to the right in Figure 1, the fibrous material or the portion of the compression chamber is then compressed against the previous already compressed portion to build on a new portion intended to form the finished member 4.

During the displacement of the compression member 8 indicated above, the filling piston is in its lower position.

Thus, successive proportions or quantities will be compressed in the compression chamber 7 and these are displaced as a unit, via a matrix, over to a heating section. There is nothing to prevent this heating section from also comprising the compression chamber 7 and this is especially true if the heating section uses a high-frequency drying plant, as in that case it is only required that the electrodes be allowed to pass the compression chamber 7 and form a recess adapted in the upper electrode. for the filling piston, used to introduce a new weighed quantity of fibrous material into the compression chamber 7.

The compressed fibrous material provided with moist binder is now introduced into the heating section and subjected there to a heat treatment by means of high frequency. after which the finished dried elongate member 4 can be discharged via a portion Sb. The finished body has here been given the reference designation 4.

The member 4 may also be desired to be transferred directly to a treatment plant 3, in which the outer surface of the member can be coated with impregnating liquid, paint, varnish or the like. 458 sšil Furthermore, Figure 1 illustrates with the reference numeral 2, a control member, through which a temporal activation can take place of the forward member of the compression member 8 and eats directed movement. Furthermore, a material and binder as well as the volume proportioning device of the individual quantities are controlled, and the fibrous material containing the device 6 and associated pressing means and other functions for operating the device 1. The specific electrical connection applicable to the control means 2 is not described, since its construction can be easily produced on the basis of the functional description that follows.

According to the present invention, the control means 2 also comprise necessary electrical connections in order to be able to operate a high-frequency drying plant.

Referring to Figure 2, there is shown a section through the high frequency dryer 5 in accordance with the present invention.

Figure 2 shows the orientation of the elongate member 4 consisting of fibrous material and binder, which passes through a matrix, the upper surface of which is constituted by one electrode 12 for the high-frequency plant, while the lower surface is constituted by the other, the grounded, electrode 13 for said high-frequency plant. .

The two side surfaces of the matrix are formed by two rods 14, 15 consisting of glass composite material and these pass in between the electrodes 12, 13.

According to the present invention it is now indicated that one electrode 12, but preferably both electrodes 12, 13, cooperate with one or more electrode heating devices 16, where four such devices 16 are arranged to cooperate with the upper electrode and four similar devices are arranged to cooperate. with the lower electrode 13.

These electrode heating means are adapted so that before starting the manufacturing process of the elongate member 4 can assign not only the electrodes 12, 13 but also the electrodes 12, 13 surrounding details, such as the rods 14, 15 and rods 17, 18. , but also other details such as an upper cover plate, such a temperature that a water condensation of the water vapor generated on cold surfaces is thus prevented.

In this context, it can be mentioned that already at the start of the drying plant, water vapor is generated during the drying of the quantities of fibrous material -binder mixed.

This water vapor normally rises upwards and if it is condensed out on cold surfaces, conditions are created for electrical discharges.

This especially applies to the electrode and the environment of the electrode that is not system grounded.

It is further proposed that air laden with water vapor should be sucked via a socket 19 from a space enclosed by the electrodes 12, 13 and the rods 14 and 15 but also a space 20 enclosing the electrodes. The outlet 20 communicates with the socket 19 via openings 21.

Preferably, the extracted air volume is adapted, via a fan device not shown in the figure, so that the air volume per unit time will be selected to connect to or substantially connect to water vapor generated in the drying plant.

In particular, if the extracted air volume is chosen to exceed the volume of water vapor generated, special consideration should be given to allowing only an insignificant amount of air to pass in through the feed side Sa, cooling.

An amount of air that is allowed to pass in through the discharge side Sb also cools it and should be avoided.

In order to ensure sufficient heat at the supply side Sa, it can also be proposed that hot air is directed towards the compression chamber 7 and in addition so that wall portions there are not exposed to one. 458 §91 11 existing parts. In this case, the extracted air volume should increase so that the hot air passes into the matrix and around the matrix and the electrodes.

The present invention further discloses that the lower electrode connected to system ground or the lower electrode 13 is fixedly connected via electrically insulating glass composite rods 18 to a lower plate 22 which is connected to the piston 8 and which thereby directly follows the displacement movement of the piston 8.

The glass composite material rod 14 is fixedly connected to a plate 23 and the glass composite material rod 15 is also fixedly connected to a plate 24 and these are slidably arranged by hydraulic pistons (not shown in the figure), corresponding to the reference numeral 9, 10. The upper electrode 12 is via similar glass composite material consisting of rods 17 fixedly connected to a plate 25.

The plates 22, 23, 24 and 25 consist of electrically conductive material. above the upper plate 25 there is a heat-insulating material 26 and above it there is a space 27, intended to conduct air vapor-laden air out through a socket 19.

The plates or parts 22, 23, 24 and 25 are coated on the inside with a copper layer for shielding the electromagnetic field. Since a certain relative movement will take place between the part 22 and the parts 23 and 24 and between the parts 23 and 24 and the part 25 there is between the parts 22 and 23 resp. 24 copper rails 30, 31 and between the part 25 and the parts 23 and 24 copper rails 32, 33.

The designated glass composite material consists of a material marketed under the trademark "ARCLEX".

With reference to Figure 3, the reference numeral 36 illustrates the connection for the energy supply to the high-frequency drying plant and when this is connected to the upper electrode 12, which is connected to the lower electrode 13 via a connection 37. , which in turn is connected via a line to system earth 38.

In addition, a plate 34 and a plate 35 are electrically connected to the electrodes 12 and 13, forming a capacitor and where the capacitance value of the capacitor can be varied by varying the distance "d" between these plates.

This can most easily be done by allowing the plate 34 to be slidably arranged along a guide towards and from the plate 35.

By adjusting the distance "d", it becomes possible to tune the high-frequency circuit to pre-desired operating conditions.

For some applications an adaptation may be required which is not dependent on the plates 34 and 35 but uses different lengths for the connection 37.

With only one or both adaptation possibilities, the voltage distribution and thus the drying effect along individual longitudinal sections of the electrodes 12 and 13 can be changed and moved. Referring to Figure 4, there is shown a circuit diagram of an electrical energy supply to the heating device 16, where this energy supply takes place across an inductance 40, 41 and with four capacitors 42 and 42a, 43 and 43a connected to system ground 38 for the high frequency system. This connection is intended to reduce the voltage generation that takes place in the high-frequency circuit and of the connection cables. to attenuate induced voltage peaks. in the device 16 of the Capacitances are intended From figure 2 it appears that a number, four pieces, heating devices 16 are located between electrically insulating glass composite material 17 and each of these is fed via a circuit shown in figure 4.

The electrical energy supply to the devices 16 located next to the lower electrode 13 can take place directly, without connection according to Figure 4, since in the electrode 13 the electrode 13 is connected to system earth 38. Resp. The device is here arranged to be enclosed by a shielded tube which is arranged to extend out of the electromagnetic field.

However, it should be noted here that the device 16 must be completely placed in a cutting tube, a copper tube, which is guided completely through the electromagnetic field.

A temperature sensing thermostat, not shown in the figure, is also connected to the upper surface of the electrode 12 and this thermostat is sensed, in the manner indicated per se in Figure 4, over an inductance and by means of a number of capacitances.

As previously mentioned, the lower electrode 13 must follow the movement of a piston 8, intended to compress, quantity of fibrous material provided with moisture binder, while the two side walls, of an electrically insulating material, are arranged to be displaced at approximately half of said movement at the same time.

The relative displacement between the stationary electrode 12 and the side walls 14, 15 and the relative displacement between the movable electrode 13 and the side walls must be so adapted that a sufficient friction is formed therefrom to connect the individual quantities of fibrous material to each other and obtain a smooth surface.

Figure 2 further shows that first rods 14, 15 formed of glass composite material are arranged to abut against the compressed quantities along two opposite sides of the member 4 and one or more second rods 17, 18 formed of glass composite material are arranged to abut and support the electrodes 12, 13 along two opposite sides.

The electrodes and rods extend from the compression member 7 to the end portion Sb. 458 591 I 14 although the embodiment is illustrated so that the compression chamber 7 is located within the dryer 5 by forming the upper electrode 12 with a recess for receiving the fibrous material binder mixture, within the scope of the invention also the embodiment that the compression chamber is and arranged at a distance from the dryer installation.

The latter embodiment can be expected to provide somewhat simplified measures during the drying process.

The invention is of course not limited to the above-mentioned embodiment but may undergo modifications within the scope of the inventive concept illustrated in the appended claims.

Claims (11)

'f 458 591 PATENT REQUIREMENTS Device for production, of one of i.a. an fibrous member consisting of an elongate member (4), by true-pressing a quantity of fibrous material provided with a binder and allowing said compressed quantity of fibrous material to dry, by passing it between the electrodes (12, 13) for a high-frequency drying plant. (5), characterized in that one electrode (12), preferably both electrodes (12, 13), for the drying plant is arranged to be able to cooperate with a device (16) heating the electrode. Device according to claim 1, characterized in that the electrode heating device (16) is adapted to, before starting the manufacturing process for the elongate member (4), be connected in such a time duration that it can allocate the electrode and the electrode therefrom. the surrounding details a temperature adapted to prevent water condensation on said electrode and / or details. 3. Device according to claim 1 or 2, characterized in that an air laden with water vapor is arranged via means to be sucked out of an exhaust enclosed by the electrodes (12, 13) and enclosing the electrodes. 4. Device according to claim 3, characterized in that extracted air volume per unit of time is via means selected to connect to or substantially connect to water vapor generated in the drying plant per unit of time. 5. A device according to claim 1, characterized in that; that an electrical energy supply to the heating device (16) is arranged to take place over an inductance. Device according to claim 1, characterized in that a heating device (16) is located between electrically insulating glass composite material (17, 18). i-458 591 ~ 7. Device according to claim 1 or S, characterized in that an electrical energy supply to the heating device (16) for one electrode (13) is arranged to take place directly. 8. A device according to claim 1, characterized in that a setting position of a temperature sensing thermostat is arranged to be evaluable over an inductance. Device according to claim 1, characterized in that a lower electrode (13) belonging to the drying plant is arranged to follow the movement of a piston (8), intended to compress the quantity of fibrous material provided with binder, while two, the drying plant (5) belong to it. side walls, consisting of electrically insulating material, are arranged to be displaced in such a way that a sufficient friction required for splicing adjacent quantities with each other is formed therefrom. 10. A device according to claim 1, characterized in that the electrodes (12, 13) are, at a distance from each other, enclosed by an electrically conductive layer to shield the high-frequency electromagnetic field. ' 11. Device according to claim 1, characterized in that first rods (14,15) formed of glass composite material are arranged to abut against the compressed quantities (4) along two opposite sides and a plurality of second rods (17,18) formed of glass composite material ) are arranged to abut against and support the electrodes (12,13) along two opposite sides.